Not my tank, so I am not 100% sure.I believe that the misting system went off shortly before I got there and the glass had not had any time to clear. I also think that the canopy might be restricting some air flow. I am now personally a fan enthusiast. Gently moving air is good!One of my favorite parts of this one is the hardscape. There are two humps that jut out from the back creating a central valley and two "half valleys" on the sides. It really breaks up the tank visually and made for a neat look that allows frogs to separate from one another.